MIT App Inventer 2 block helper

An easy way to operate blocks at MIT App Inventor 2.

main function:

1. find blocks by key work
2. remove all comments
3. download top blocks seperately (ignore orphan blocks)
4. outline of all top blocks

v0.7.8 fix bug for update outline only show 'iiiiii' remove functions for "scroll pallatte seperately", since nb197c have this function natively with neo interface.